<!DOCTYPE html>
<html>
<head>
  <script src="https://cdn.rawgit.com/konvajs/konva/1.4.0/konva.min.js"></script>
  <meta charset="utf-8">
  <title>Konva Quantum Squiggle Demo</title>
  <style>
    body {
      margin: 0;
      padding: 0;
      overflow: hidden;
      background-color: #F0F0F0;
    }
  </style>
</head>
<body>
  <div id="container"></div>
  <script>
    var width = window.innerWidth;
    var height = window.innerHeight;

    var stage = new Konva.Stage({
        container: 'container',
        width: width,
        height: height
    });
    var layer = new Konva.Layer();
    var colors = ['red', 'orange', 'yellow', 'green', 'blue', 'purple'];
    var blobs = [];

    // create 6 blobs
    for(var n = 0; n < 6; n++) {
        // build array of random points
        var points = [];
        for(var i = 0; i < 5; i++) {
            points.push(stage.width() * Math.random());
            points.push(height * Math.random());
        }

        var blob = new Konva.Line({
            points: points,
            fill: colors[n],
            stroke: 'black',
            strokeWidth: 2,
            tension: 0,
            opacity: Math.random(),
            draggable: true,
            closed : true
        });

        layer.add(blob);
        blobs.push(blob);
    }

    stage.add(layer);

    var period = 2000;
    var centerTension = 0;
    var amplitude = 1;

    var anim = new Konva.Animation(function(frame) {
        for(var n = 0; n < blobs.length; n++) {
            blobs[n].setTension(amplitude * Math.sin(frame.time * 2 * Math.PI / period) + centerTension);
        }
    }, layer);

    anim.start();
  </script>

</body>
</html>